96 lines
1.9 KiB
Plaintext
96 lines
1.9 KiB
Plaintext
/**
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* @typedef {import('unist').Node} Node
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* @typedef {import('unist').Point} Point
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* @typedef {import('unist').Position} Position
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*/
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/**
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* @typedef NodeLike
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* @property {string} type
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* @property {PositionLike | null | undefined} [position]
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*
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* @typedef PositionLike
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* @property {PointLike | null | undefined} [start]
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* @property {PointLike | null | undefined} [end]
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*
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* @typedef PointLike
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* @property {number | null | undefined} [line]
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* @property {number | null | undefined} [column]
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* @property {number | null | undefined} [offset]
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*/
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/**
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* Get the ending point of `node`.
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*
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* @param node
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* Node.
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* @returns
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* Point.
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*/
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export const pointEnd = point('end')
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/**
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* Get the starting point of `node`.
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*
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* @param node
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* Node.
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* @returns
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* Point.
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*/
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export const pointStart = point('start')
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/**
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* Get the positional info of `node`.
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*
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* @param {'end' | 'start'} type
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* Side.
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* @returns
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* Getter.
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*/
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function point(type) {
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return point
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/**
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* Get the point info of `node` at a bound side.
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*
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* @param {Node | NodeLike | null | undefined} [node]
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* @returns {Point | undefined}
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*/
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function point(node) {
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const point = (node && node.position && node.position[type]) || {}
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if (
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typeof point.line === 'number' &&
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point.line > 0 &&
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typeof point.column === 'number' &&
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point.column > 0
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) {
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return {
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line: point.line,
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column: point.column,
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offset:
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typeof point.offset === 'number' && point.offset > -1
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? point.offset
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: undefined
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}
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}
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}
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}
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/**
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* Get the positional info of `node`.
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*
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* @param {Node | NodeLike | null | undefined} [node]
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* Node.
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* @returns {Position | undefined}
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* Position.
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*/
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export function position(node) {
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const start = pointStart(node)
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const end = pointEnd(node)
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if (start && end) {
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return {start, end}
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}
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}
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